Econologica.org

Farthing Penny Arm Push and Pull Grocery Bike 2017: VIDEO N.B YOU assume ALL responsibility in using this FREE webpage info

Arm pulling has been added to complement the 2015 arm pushing and at least double the arm power boost. Pulling the handlebars drives a (overhung) 12 tooth RH freewheel on the smaller 20” front wheel via

an idler pulley around the axial lower handlebars. This gear matches the 16T LH freewheel on the 26” rear wheel drawn by pushing the handlebars. Rather than supporting a pull point far away from the existing

frame with the further difficulty of transferring pull through it to the yawing front wheel, the existing wire from handlebars to seat was doubled with a tube that slides under the middle of the handlebars ontop of a wide

pulley. A new wire under the tube from its front end turns through a deep groove in the center of the pulley and then runs down and a bit to the right to crossloop the idler pulley which stops it from derailing.

The only wire vs. wire slip is radial at the crossed tangents and no wire wear or damaging is noticeable after 6 months.

The shockcord inter-tie of arm push and pull is routed from down on the RH of the gooseneck to down and back on the LH.via 2 pulleys of 90° wrap on top of the gooseneck. Concerns about pulling oneself

off the saddle did not materialize. Rather uphill one can pull the handlebars very hard.and the armpower is more than doubled. Now all muscles in the arms and stomach and back muscles are exercised.

A final step will be to use add electric assist probably at the left pedal crank. (Also road tested in 2017 was flanging the frame joints when reversing them to make the Farthing Penny compact luggage if required.)